Switch B - Select Smart or Normal Setback Recovery
Selects between normal and smart recovery from setback. Normal
recovery changes to the new set point at the programmed time.
Smart recovery, which is active in heating mode only, starts earlier
and adjusts the set point slowly so that room temperature will
arrive at the programmed temperature at the programmed time.
TO SET:
OFF—for smart recovery. This is the factory default.
ON—for normal recovery.
Switch C - Select Enable/Disable of Low-Ambient Cooling
Use to allow or prevent cooling operation below an outdoor
temperature of 55°F. Prevention of cooling below 55°F adds to
compressor reliability. If outdoor temperature sensor fails or is
disconnected, cooling is allowed regardless of switch setting.
TO SET:
OFF—cooling is disabled at outdoor temperatures below 55°F.
ON—cooling is enabled at outdoor temperatures below 55°F.
Switch D - Select Single-Speed or 2-Speed HP
Use this switch to tell dual fuel thermostat whether it is controlling
a single- or 2-speed HP. It must be set properly.
TO SET:
OFF—for single-speed HP.
ON—for 2-speed HP.
Step 3—Install Thermostat
Before installing thermostat, turn off all power to unit. There
may be more than 1 power disconnect. Electrical shock can
cause personal injury or death.
1. Turn OFF all power to unit.
2. If an existing thermostat is being replaced:
a. Remove existing thermostat from wall.
b. Disconnect wires from existing thermostat, 1 at a time. Be
careful not to allow wires to fall back into the wall.
c. As each wire is disconnected, record wire color and
terminal marking.
d. Discard or recycle old thermostat.
NOTE:
Mercury is a hazardous waste and MUST be disposed of
properly.
3. Open thermostat rear door (mounting base) to expose mount-
ing holes. The base can be removed to simplify mounting.
Snap apart carefully at hinge to separate mounting base from
remainder of thermostat.
4. Route thermostat wires through large hole in mounting base.
Level mounting base against wall (for aesthetic value
only—thermostat need not be leveled for proper operation)
and mark wall through 2 mounting holes.
5. Drill two 3/16-in. mounting holes in wall where marked.
6. Secure mounting base to wall with 2 screws and anchors
provided, (additional anchoring holes available for more
secure mounting if needed) making sure all wires extend
through hole in mounting base.
7. Adjust length and routing of each wire to reach proper
terminal and connector block on mounting base with 1/4 in. of
extra wire. Strip only 1/4 in. of insulation from each wire to
prevent adjacent wires from shorting together when con-
nected.
8. Match and connect equipment wires to proper terminals of the
connector blocks. (See Fig. 2 through 9.) Both R and C must
be connected for proper thermostat operation.
Improper wiring or installation may damage the thermostat.
Check to make sure wiring is correct before proceeding with
installation or turning on unit.
9. Push any excess wire into wall and against mounting base.
Seal hole in wall to prevent air leaks. Leaks can affect
operation.
10. Snap hinge back together.
11. Close thermostat assembly making sure pins on back of circuit
board align with sockets in connector.
12. If this is a replacement installation, be sure to remove the
interface control which may have been used to interface a
standard thermostat to a dual fuel installation. All the wires
(with the exception of the outdoor sensor S1 and S2 wires)
from the thermostat go directly to the furnace. The interface
control must be removed and not used.
13. Turn ON power to unit.
On power up, display shows dF or d2 for a few seconds to indicate
that it is a dual fuel thermostat. (See page 11.)
Step 4—Set Thermostat Configuration
Configuration options, like DIP switch settings, are intended to be
selected at installation and normally are not modified by the
homeowner. These options are not discussed in the Homeowner’s
Manual and therefore must be selected as part of the installation.
A special procedure allows entry into the configuration mode.
While in the configuration mode, 7 selections can be made. A
description of each of these and how to use the configuration mode
follows.
CONFIGURATION OPTIONS—SUMMARY:
Option 01—Anticipator adjustment
Option 02—Clean filter timer adjustments
Option 03—Fahrenheit or Celsius operation
Option 04—07—Not applicable
Option 08—Auxiliary heat lockout setting
Option 09—10—Not applicable
Option 11—Balance point setting
Option 12—Not applicable
Option 13—Room temperature offset adjustment
Option 14—Not applicable
Option 15—Enable AUTO mode
TO ENTER THE CONFIGURATION MODE:
Press and hold FAN button for approximately 10 sec until COOL
set point display indicates a flashing 01. The thermostat is now in
the configuration mode. It will automatically exit this mode if no
button is pressed for 3 minutes. Pressing END button will exit the
configuration mode immediately.
WHILE IN THE CONFIGURATION MODE:
The upper small (COOL set point) display indicates the selected
option number and the large display indicates the selection made
within that option. One of these will be flashing. The up and down
buttons are used both to move between the available options and to
make selection for each option. When the option number (small
display) is flashing, the up and down buttons adjust it, moving
between the available option numbers. After the desired option
number has been selected, press SET TIME/TEMP button once.
The large disply will now flash, indicating that the up and down
buttons now control the available choices within that option. Each
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